Barette Rejoins White Mountains Board

August 7, 2006

The Board of Directors of the Bermuda-ybased White Mountains Insurance Group, Ltd. has elected Ray Barrette as a Director of the Company.

Barrette served as the Company’s President and CEO from January 2003 until his retirement in October 2005. He previously served as a Board member from February 2000 to October 2005.

Chairman Jack Byrne commented: “I am pleased that Ray is rejoining the Board. He will provide us with his valuable insights into our businesses. His judgment and extensive experience in our industry will benefit our owners.”